linux-kernel - Re: [PATCH] omap2: fix DPLL

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Message-ID: <20110120111645.GB2223@legolas.emea.dhcp.ti.com>
Date:	Thu, 20 Jan 2011 13:16:45 +0200
From:	Felipe Balbi <balbi@...com>
To:	John Ogness <john.ogness@...utronix.de>
Cc:	paul@...an.com, tony@...mide.com, r-woodruff2@...com,
	linux-kernel@...r.kernel.org,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	Linux ARM Kernel Mailing List 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] omap2: fix DPLL_FREQSEL calculation

Hi,

On Thu, Jan 20, 2011 at 11:42:24AM +0100, John Ogness wrote:
> This patch fixes the calculation of the internal frequency. The value
> of "n" is one less than the actual divider. 0 is a valid value.
> 
> An example where the internal frequency is calculated correctly can be
> found here: clkt_dpll.c:_dpll_test_fint()
> 
> This patch is against linux-next-20110120.
> 
> Signed-off-by: John Ogness <john.ogness@...utronix.de>

scripts/get_maintainer.pl would've helped you getting a better Cc list.
I'm adding linux-omap and lakml

> ---
>  arch/arm/mach-omap2/dpll3xxx.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> --- a/arch/arm/mach-omap2/dpll3xxx.c	2011-01-20 11:20:41.706860086 +0100
> +++ b/arch/arm/mach-omap2/dpll3xxx.c	2011-01-20 11:21:27.966860086 +0100
> @@ -93,7 +93,7 @@ static u16 _omap3_dpll_compute_freqsel(s
>  	unsigned long fint;
>  	u16 f = 0;
>  
> -	fint = clk->dpll_data->clk_ref->rate / n;
> +	fint = clk->dpll_data->clk_ref->rate / (n + 1);
>  
>  	pr_debug("clock: fint is %lu\n", fint);
>  
> --
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-- 
balbi
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